Good luck, I've played a few 500 point games, and it's really rough on Nighthaunt. We need a lot of support for our lists to work and we just don't have it available at that point level. 2v2 should help make that a bit easier.
My opinion for what is holding Nighthaunt back contrary to to popular belief, I don't think Night haunt is in a bad spot. That being said, it's going to be ease of use and complexity compared to a lot of the other armies. It's a lot easier when you have an automatic chart ala DoK or Deepkin that gives your entire army a massive buff or the ability to bring back entire slain units compared to making sure you have all the right bubbles, your heros are staying alive, making the right deployment/reserve choices. In other words, Nighthaunt is a lot less forgiving, and this learning curve can turn a lot of people off of the army.
I can totally understand it. It's much easier, and forgiving on the tabletop if you are playing LoN and then bringing back whole entire units of Grimghasts, for very little trade off.
To be fair on this, I do think there was some serious power creep with Deepkin and DoK. I don't really think new books should be aimed that level, but instead those two need to be brought down. LoN has a host of things that need to be addressed, but I feel like all of these just need some light touches in the right place.